[Users] iscsi mpio

[René Koch (ovido)]

Hi,

I can give you some information on multipathing on RHEV-H, as I don't
have ovirt-node installed at the moment.

Multipath packages are installed on the hypervisor, but vdsm overwrites
multipath.conf.

To prevent this you have to set the following tags:
# RHEV REVISION 0.7
# RHEV PRIVATE

Search for MPATH_CONF_TAG in multipath.py file to get correct RHEV REVISION number.

After changing multipath.conf to fit your needs make it persistent for
reboots:
# persist /etc/multipath.conf


You can check multipath status with:

# multipath -ll
mpathb (2222b00015521f5d4) dm-0 Intel,Multi-Flex
size=96G features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| `- 0:0:0:1 sdb 8:16 active ready running
mpatha (222140001553601d1) dm-1 Intel,Multi-Flex
size=20G features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| `- 0:0:0:0 sda 8:0  active ready running

I hope this helps.
Don't really know if the tags are the same in oVirt, as I don't have a working oVirt setup at the moment.


-- 
Best Regards,

DI (FH) René Koch
Senior Solution Architect

============================================
ovido gmbh - "Das Linux Systemhaus"
Brünner Straße 163, A-1210 Wien

Phone:   +43 720 / 530 670
Mobile:  +43 660 / 512 21 31
E-Mail:  r.koch at ovido.at
============================================


On Fri, 2012-12-07 at 13:55 +0000, Jonathan Horne wrote:
> 
> 
> From: Jonathan Horne <jhorne at skopos.us>
> Date: Thursday, December 6, 2012 1:04 PM
> To: users <users at ovirt.org>
> Subject: [Users] iscsi mpio
> 
> 
> 
> Hello,
> 
> 
> I just rebooted my iscsi SAN and the ovirt node 2.5.5fc17 did not
> enjoy that one bit.   Does ovirt node support multi path i/o?  Any
> information about this would be greatly appreciated.
> 
> 
> Thanks,
> jonathan
> 
> 
> 
> 
> 
> 
> I attempted to install the multi path driver on node 2.5.5-0.fc17, but
> the file system is read only and i can't make changes. 
> 
> 
> I really need to find out about multipathing, because yesterday i
> upgraded the firmware on my iscsi SAN yesterday, and one of my nodes
> freaked out and rebooted (oddly, the other 2 didn't).  In understand
> there may already be multi path configured within the node, but how do
> i verify it with my set up?
> 
> 
> Thanks,
> jonathan
> 
> 
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